Effect of mechanical smoke exhaust on combustion characteristics of indoor transformer fire
In order to study the dynamic process of indoor transformer fire under different mechanical exhaust volumes and explore the optimal exhaust volume suitable for indoor transformer fire of different sizes,based on FDS numerical simulation technology,this paper adopted the plume method to calculate the exhaust volume,and studied the combustion characteristics of indoor transformer fire under mechan-ical exhaust conditions for three types of fire power sources:6 MW,12 MW and 18 MW.The results show that:The combustion forms are different under different fire source powers without mechanical exhaust.The mechanical exhaust volume is positively correlated with the power of fire source.The cool-ing amplitude and visibility increase amplitude are the largest when 2 times the calculated mechanical smoke exhaust volume is used for transformer fire of different sizes,so the cooling and smoke control effect of 2 times the mechanical smoke exhaust volume is the best.Among them,the optimal smoke ex-haust volume of 6 MW fire power is 23.8 m3/s,that of 12 MW fire power is 41.7 m3/s,and that of 18 MW fire power is 58.6 m3/s.Reasonable increase of mechanical exhaust volume can reduce the risk of window overflow fire caused by the spread of indoor transformer fire,and effectively inhibit the development of flames.Under the same fire source power,with the increase of mechanical exhaust vol-ume,the indoor temperature of the main transformer decreases significantly and the visibility increases.The research results provide a reference for fire safety protection in the main transformer room of indoor substation.
transformer roomtransformer firenumerical simulationmechanical smoke exhaustsmoke exhaust volumetemperature distribution
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